I've been to Niagara Falls more times than I can count, and it is ALWAYS simply incredible. I've stood by the falls for hours, until soaked by the spray. I've also been there when the smaller section (The American falls) was frozen.
Need to take the subway in Toronto after restoring order to the Mushroom Kingdom? Dave Delisle of Dave's Geeky Ideas has got you covered: Here's the Toronto TTC Subway/RT Map, in the style of Super Mario Link - via Boing Boing .